Carbazole dyestuffs

ABSTRACT

NEW PHENYL-HETERYL-METHANE DYESTUFFS ADAPTED FOR USE IN DYEING AND PRINTING OF MATERIALS OF LEATHER, TANNINTREATED COTTON, CELLULOSE ACETATE, SYNTHETIC SUPER POLYAMIDES AND POLYURETHANES AND FOR THE DYEING OF FIBERS CONTAINING LIGNIN SUCH AS COCO, JUTE AND SISAL OR FOR THE PRODUCTION OF WRITING LIQUIDS, STAMP DYES, PASTE FOR BALLPOINT PENS OR FOR USE IN OFFSET PRINTING, OR FOR DYEING AND PRINTING OF MATERIALS CONSISTING COMPLETELY OR PARTIALLY OF POLYMERS OR COPOLYMERS OF ACRYLONITRILE OR VINYLIDEND CYANIDE OR ACID-MODIFIED POLYESTER MATERIALS AND ARE CHARACTERIZED ON THESE LATTER MATERIALS BY GOOD FASTNESS TO LIGHT, WET PROCESSING, RUBBING AND SUBLIMATION, AS WELL AS HAVING GOOD AFFINITY TO THE FIBERS AND GOOD FASTNESS TO CROSS-DYEING.

United States Patent Int. Cl. c07d 27/68 7 US. Cl. 260-315 2 Claims ABSTRACT OF THE DISCLOSURE New phenyl-heteryl-methane dyestufis adapted for use in dyeing and printing of materials of leather, tannintreated cotton, cellulose acetate, synthetic super polyamides and polyurethanes and'for the dyeing of fibers containing lignin such as coco, jute and sisal or for the production of writing liquids, stamp dyes, paste for ballpoint pens or for use in offset printing, or for dyeing and printing of materials consisting completely or partially of polymers or copolymers of acrylonitrile or vinylidene cyanide or acid-modified polyester materials and are characterized on these latter materials by good fastness to light, wet processing, rubbing and sublimation, as well as having good afiinity to the fibers and good fastness to cross-dyeing.

The present invention relates to valuable new phenylheteryl-methane dyestuffs of the general formula In this formula R denotes hydrogen, an alkyl, cycloalkyl or aralkyl radical and Z means the residual members of 5- or 6-membered ring which may contain a fused further siX-membered carbocyclic ring; B stands for an aminoaryl radical of the general formula in which R denotes hydrogen, an alkyl ,or aryl group, a carboxylic acid ester group, anoptionally N-substituted carbonamide group or an alkoxy group, vand R means hydrogen, an alkyl, aralkyl, cycloalkyl or aryliradical; X

stands for ananionicradical.

A group of particularly valuable dyestuifs within the 3,752,822 Patented Aug. 14, 1 9773 scope of the new products of the General Formula I corresponds to the general formula In this formula R stands fora lower alkyl radical, especially methyl or ethyl, R' means methyl, phenyl or phenyl substituted by chlorine, bromine or lower alkyl or alkoxy radicals, and R, stands for hydrogen or a lower alkyl radical, such as methyl, ethyl, or for benzyl; X denotes an anionic radical.

Another group of particularly valuable dyestuffs corresponds to the general formula 1'4 In this formula R, R' R, and X have the same meaning as in Formula IV, whilst the radicals R to R stand for hydrogen or lower alkyl radicals, and the radicals R and R may also be fused to form a cycloalkylene ring.

The new dyestufis are obtained by condensing benzoyl compounds of the general formula in which R and Z have the same meaningas above, with aromatic amines of the formula '(VII) or with indole derivatives of the formula J' ILA (VIII in the presence of acidic condensation agents to form dyestuffs of the Formula I, selecting starting components which are free from sulphonic acid and 'carboxylic acid groups.

The following benzoyl compounds (VI) are suited as starting material for the production of the dyestulfs according to the invention, for example:

3-benzoyl-9-methy1carbazole, 3-benzoyl-9-ethylcarbazole, 3-benzoyl-9-butylcarbazole, 3-benzoyl-9-cyanoethylcarbazole,

3-benzoyl-9-chloroethylcarbazole, 3-benzoyl-9-hydroxyethylcarbazole, 3-benzoyl-9-benzylcarbazole, 3-benzoyl-6-chloro-9-ethy1carbazole, 3-benzoyl-6-bromo-9-ethylcarbazole, 3-benzoyl-6-methyl-9-ethylcarbazole, 3-benzoyl-S-methoxy-9-methylcarbazole, 3-(4-methy1benzoyl)-9-ethylcarbazole,

3- 4'-methylb enzoyl -5 -methoxy-9-methylcarba201e, 3-(4'-methoxybenzoyl)-9-ethylcarbazole, 3-(4'-methoxybenzoyl)-5-methoxy-9-methylcarbazole, 3-(4-chlorobenzoyl)-9-ethylcarbazole, 3-(2'-ch1orobenzoyl)-9-ethylcarbazole, 3-(3'-chlorobenzoyl)-9-ethylcarbazole, 3-(2,5'-dichlorobenzoyl)-9-ethylcarbazole, 3-(2'-methylbenzoyl)-9-ethy1carbazole, 3-(3'-methylbenzoyl)-9-ethylcarbazole, -1,-2,3,3-tetramethyl-5-benzoyl-dihydroindole, -1-ethyl-2,3,3-trimethyl-S-benzoyl-dihydroindole, 1,2,3,3-tetramethy1-5-benzoyl-7-methyldihydroindole, 1,2,3,3-tetramethyl-5-benzoyl-7-methoxy-dihydroindole, 1,2,3,3-tetramethyl-5-benzoyl-7-chloro-dihydroindole, 1,2,3,3-tetramethy1-5-(4'-methy1benzoyl)-dihydroindole, 1,2,3,3-tetramethyl-5-(2'-methylbenzoyD-diliydroindole, 1,2,3,3-tetramethyl-'5-(3'-methylbenzoyl)-dihydroindole, 1 3

,2, ,3-tetramethyl-5-(4-methoxybenzoyD-dihydroindole, ,2, ,3-tetramethyl-5-(2'-chlorobenzoyl)-dihydroindole, ,2, ,3-tetrarnethyl-5-(3'-chlorobenzoyD-dihydroindole, ,2,3,3-tetramethyl-5-(4-chlorobenzoyD-dihydroindole, l,2,3,3-tetramethyl-5-(2',5'-dichlorobenzoyl)-dihydroindole, 1,Z-dimethyl-S-benzoyl-Z,B-dihydroindole, l-methyl-2-pheny1-S-benzoyl-2,3-dihydroindole, 1-ethyI-Z-phenyl-S-benzoyl-2,3-dihydroindole, l-methyl-Z-phenyl-S-(2-chlorobenzoyl)-2,3-dihydroindole, 1-methy1-6-benzoyl-1,2,3,4-tetrahydroquinoline, l-methyl-6-(2-chlorobenzoyl)-1,2,3,4-tetrahydroquinoline, 1-ethyl-6- (4'-chlorob enzoyl) -1,2,3,4-tetrahydroquinoline, 1-methyl-6-(4'-methylbenzoyl)-1,2,3,4-tetrahydroquinoline, 1methyl-6-(4'-methoxybenzoyl)-1,2,3,4-tetrahydro quinoline, 6-benzoyl-9-methyl-1,2,3,4, 10,1 l-hexahydrocarbazole, 6-(2-chlorobenzoyl)-9-methyl-1,2,3,4, 10, 1 l-hexahydrocarbazole.

Suitable aromatic amines of the General Formula VII are, for example:

N ,N-dimethylaniline,

N,N-diethylaniline,

N,N-dibutylaniline, N-methyl-N-hydroxyethylaniline, N,N-dihydroxyethylaniline, N-methyl-N-chloroethylaniline, N,N-dichloroethylaniline, 1 N-ethyl-N-hydroxyethylamino-3-methy1benzene, 1-N-ethyl-N-chloroethylamine-3-methylbenzene, N-butyl-N-hydroxyethylaniline, 3-chloro-N,N-diethylaniline, 3-chloro-1-N,N-dibutylaniline, 3-chloro-l-N,N-dimethylaniline, N-methyl-N-benzylaniline, N-ethyl-N-benzylaniline, 1-N-ethyl-N-benzylamino-3-rnethylbenzene, N-methyl-diphenylamine, N-ethyldiphenylamine, N-cyanoethyl-diphenylamine, N-(4-ethoxyphenyl)-N-methylaniline, N-(4-methylphenyl)-N-methylaniline,

N -(Z-ethoxyphenyl)-N-methylaniline, 3-methoxy-l-N, N-dimet.hylaniline and 3-ethoxy-1-N,N-diethylaniline.

Suitable indole derivatives of the General Formula VIII are, for example:

Z-methylindole,

2-phenylindole, 2,5-dimethylindole, 2-methyl-5-chloroindole, 2-phenyl-5-methylindole, 2-phenyl-5-chloroindole, 1,2-dimethylindole, l-methyl-Z-phenylindole, 1,2,5-trimethylindole, 1,5-dimethyl-2-phenylindole, 1,Z-dirnethyl-S-chloroindole, 1-methyl-2-phenyl-S-chloroindole, I-et-hyI-Z-methylindole, 1-ethyl-2-phenylindole, 1-ethy1-2,5-dimethylindo1e, l-ethyl-2-phenyl-S-methylindole, l-ethyl-2-methy1-5-chloroindole, 1-ethyl-2-phenyl-5-chl0roindole, 1-benzyl-2-methylindole, 1,4,7-trimethyl-Z-phenylindole, l-n-butyl-Z-phenylindole, l-isobutyl-2(4'-chlorophenyl)-4,6-dimethylindole, 1-cyanoethyl-2-methylindole, 1-cyanoethyl-2-phenylindole.

Suitable acidic condensation agents are, for example: phosphorus oxychloride, thionyl chloride, phosgene, zinc chloride, aluminium chloride, tin tetrachloride, antimony pentachloride.

The reaction can be carried out in the presence or absence of an inert solvent. Suitable solvents are, for example, chlorobenzene, o-dichlorobenzene, toluene, xylene, benzene, ligroin, dioxan, cyclohexane, carbon tetrachloride, trichloroethylene and chloroform.

The reaction is generally carried out at an elevated temperature, for example, at 40160 0., preferably at 70120 C.

The anionic radicals X- may be inorganic as well as organic ions; examples are: Cl", Br", CH SO ptoluene-sulphonate, H benzene-sulphonate, p-chlorobenzene-sulphonate, phosphate, acetate, formate, propionate, oxalate, lactate, maleinate, crotonate, tartrate, citrate, N0 perchlorate, ZnCl The type of the anionic radicals is of no importance for the properties of the dyestuffs, provided they are substantially colourless radicals and do not impair the solubility of the dyestuffs in an undesirable manner.

According to a further process, part of the dyestulfs according to the invention can also be obtained by condensation of amino-benzophenones of the general formula with compounds of the general formula R I N in which R, R R and Z have the same meaning as above, in the presence of acidic condensation agents.

Suitable aminobenzophenones of the General Formula IX are, for example:

4-N,N-dimethylaminobenzophenone, 4-N,N-diethylaminobenzophenone, 4-N,N-dibutylarninobenzophenone, 4-N-methyl-N-hydroxyethylarninobenzophenone, 4-N-methyl-N-chloroethylaminobenzophenone,

4-N-methyl-N-cyanoethylaminobenzophenone, 4-N-ethyl-N-chloroethylaminobenzophenone, 4-N-ethyl-N-hydroxyethylaminobenzophenone, .4-N-butyl-N-hydroxyethylaminobenzophenone, 4-N-butyl-N-chloroethylarninobenzophenone, 4-N,N-dihydroxyethylaminobenzophenone, 4-N,N-dichloroethylaminobenzophenone, 4-N-methyl-N-benzylaminobenzophenone, 4-N-ethyl-N-benzylaminobenzophenone, 4-N-phenyl-N-methylaminobenzophenone, 4-N- (4-ethoxyphenyl -N-methylaminobenzophenone, 4-N-(2-ethoxyphenyl)-N-methylaminobenzophenone, 4-N- 4-methylphenyl -N-methylaminob enzophenone, 2-methyl-4-diethylaminobenzophenone, 2-chloro-4-N,N-diethylaminobenzophenone, 2-methyl-4-N-hydroxyethyl-N-ethylaminobenzophenone, 2-chloro-4'-N,N-dimethylaminobenzophenone, 2-bromo-4'-N,N-diethylaminobenzophenone, 3-chloro-4-N,N-diethylaminobenzophenone, 4-ethyl-4'-N,N-diethylaminobenzophenone, 4-cyano-4'-N,N-diethylaminobenzophenone, 2-chloro-4'-N-phenyl-N-methylaminobenzophenone, 2-chloro-4'-N-(4"-ethoxyphenyl)-N-methylaminobenzophenone, 3-chloro-4'-N-phenyl-N-methylaminobenzophenone, 4-phenyl-4'-N-phenyl-N-methylaminobenzophenone, 4-ethyl-4'-N-phenyl-N-methylaminobenzophenone, 4-methyl-4'-N-(4-ethoxyphenyl)-N-methylaminobenzophenone, 4-methyl-4'-N,N-dimethylaminobenzophenone, 4-methyl-4'-N-phenyl-N-methylaminobenzophenone, 4-cyano-4'N,N-dimethylaminobenzophenone, 4-carbomethoxy-4'-N,N-dimethylaminobenzophenone, 4-methylsulphonyl-4-N-phenyl-N-methylaminobenzophenone.

Suitable compounds of the General Formula X are for example: I

also be obtained by condensation of benzoyl-indoles of thegeneral formula wherein R and R have the same meaning as above, with compounds-of the General Formula X in the presence of acidic condensation agents.

Benzoyl-indoles of the General Formula XI suitable for the production of the dyestufl s according to the invention are, for example: 1-methyl-2-pheny1-3-benzoylindo1e, 1,2-dimethy1-3-benzoylindole, l,2,5-trimethyl-3-benzoylindole, 1,5-dimethyl-2-phenyl-3-benzoylindole, l,2-dimethyl-3-benzoyl-5-chloroindole, 1-methyl-2-phenyl-3-benzoyl-5-chloroindo1e, 1-ethyl-2-phenyl-3-benzoylindole, 1-ethyl-2-methy-3-benzoylindole, 1-benzyl-2-methyl-3-benzoy1indole, 1,4,7-trimethyl-2-phenyl-3-benzoylindo1e, 1-n-buty1-2-phenyl-3-benzoylindole, l-cyanoethyl-2-methyl-3-benzoylindole, 1-cyanoethyl-2-phenyl-3-benzoylindole, 1-methyl-2- 2'-chlorophenyyl -3 -benzoylindole, 1-methyl-2-pheny1-3-(2'-chlorobenzoyl)-indole, 1-methyl-2-phenyl-3 3'-chlorobenzoyl -indole, 1-methyl-2-phenyl-3-(4'-methylbenzoyl)-indole, 1,2-dimethyl-3- 2'-chlorobenzoyl -indo1e, 1,2-dimethyl-3- 3'-chlorobenzoyl -indole, 1,2-dimethyl-3-(4-methylbenzoyl)-indole, l-ethyl-2-phenyl-3-(2-chlorobenzoyl)-indole.

Another suitable process for the production of the new dyestuffs consists in that benzanildes of the formula are reacted with heterocyclic compounds of the General Formula X in the presence of acidic condensation agents and the intermediate product is subsequently condensed, without being isolated, with aromatic amines of the General Formula VII or with indoles of the General Formula VIII.

Examples of benzanilides (XII) which are suitable for this process, are: benzanilide, 2-ch1orobenzanilide, 3- chlorobenzanilide, 4 chlorobenzanilide, 2 methylbenzanilide, 3 methylbenzanilide, 4 methylbenzanilide, 2- methoxybenzanilide, 2- ethoxybenzanilide, 2,4-dimethylbenzanilide, 2,5-dichlorobenzanilide, 2,6 dichloroben zanilide.

Suitable aromatic amines (VII), indoles of the Formula VIII and heterocyclic compounds of the Formula X are the same compounds which have already been mentioned for the preceding methods.

Suitable acidic condensation agents are, in this case, phosphorus oxychloride, thionyl chloride, phosgene, zinc chloride, aluminium chloride and the like.

The products which can be obtained according to the present process are valuable dyestuffs which can be used for the dyeing and printing of materials of leather, tannintreated cotton, cellulose acetate, synthetic superpoly amides and -polyurethanes, and for the dyeing of fibres containing lignin, such as coco, jute and sisal. They further suitable for the production of writing liquids, stamp dyes, pastes for ball point pens, and they can also be used in offset printing.

Above all, they are well suited for the dyeing and printing of materials consisting completely-or in part of polymers or copolymers of acrylonitrile or vinylidene cyanide or consisting of acid-modified polyester materials, such as polyethylene glycol terephthalates which contain sulphonic acid groups (type Dacron 64, manufactured by Du Pont de Nemours and Company), as are described, for example, in Belgian patent specification No. 549,179 and US. patent specification No. 2,893,816, and they are characterised on these materials by a very good fastness to light, wet processing, rubbing and sublimation. They also have a very good affinity to these fibres and good fastness to cross-dyeing. With anionic precipitating agents, such as alumina, tannin, phosphotungstic (molybdic) acids, the dyestuffs form pigments which are fast to light and can be used with advantage for paper 'printing.

7 EXAMPLE 1 43.9 parts by weight 3-(2'-chlorobenzoy1)-9-ethylcarbazole are mixed, while stirring, with 40 parts by weight phosphorus oxychloride and subsequently with 27.3 parts by weight l-methyl-Z-phenylindole. The reaction mixture is then heated to 100 C. and kept at this temperature for 3 hours.

The melt is added, while still warm, to 800 parts by volume of warm water at 50 C. and the mixture is stirred overnight.

The dyestuif resin so obtained is separated and dis (B ZnClr and dyes fibres of polyacrylonitrile in a greenish blue shade fast to light.

If the reaction is carried out with the benzoylcarbazoles and indole derivatives listed in the following table according to the process described above, dyestuffs are also obtained which are characterised by very good dyeing properties and dye polyacrylonitrile fibres in the specified shades.

Shade on poly- Benzoyl-carbazole Indole aerylomtnle 3-(2-chlorobenzoyl)-9- 1,2-dimethylindole ..Violet.

ethylearbazole.

D 2-methy1indole.--:.;.; 3-beirzoyl-9-ethyle ba- 1,2-dimethy1indole.

re a.

Do Z-methylindole Dol-methyl-Zphenylindole Dol-ethyl-2-phenylindole- Do 1, -dimethyl-2-pheny1- indole. Do 2-phenylindole Grey-green. 3-(4-chlorobenzoyl)-9- 1,2-dimethylindole- Bluish violet.

ethylearbazole 2-methylindole 1-methyl-2-phenylindole 1-ethyl-2-pheny1indole. 0. Do 1, 5-dimethyl-2-phenyhndole Blue-grey. 3-(4'-methy1benzoy1)-9- 1,2-dimethy1indole Bordeaux.

ethylcarbazole.

Do.--. 2methy1indo1e Do. Do- Lmethyl-2-phenylindole- Bluish grey Do 1,i5-r(l1in1aethyl-2-pheny1- D0.

n o e. 3-(4'-methoxybenzoyl)- 1, 2-dimethy1ind0le...:.:-;;:. Bluish red.

9-ethylcarbazole.

Do 2-methyhndole.. Do. Do l-methyl-Z-phenylindo e Bllish Boreaux. 3-benzoyl-51g1eth oxy'9- 1, Z-dimethylindole. Red-violet.

moth lcar azo e.

D03 2-methylindole r.:::. Bluish Bordeaux. r l-methyl-Z-phenylindole- Grey-green.

.- 1,15-dinl1ethy1-2-pheny1- Blue-grey.

ndo e. 3-(4'-meth0xybenzoyl)- l-methyl-Z-phenylindole-..: Currant grey.

fi-rrietholxy-tl-methylcar are e.

Do.....- 2-methy1indole..:.:...:-.:::. Reddish Bordeaux. Do..:-. 1,Z-dimethylindolar;.: Do. Do 1-ethy1-2-phenylindole- Currant grey. 3- '-methy1benzoyl)- 2-methy1indole Bordeaux.

5-1rg:tho1xy-9methylar azo e. 0 D0 1, 2-dimethylindole.;.;-:.e... Bluish Bordeaux. Do. l-methyl-Z-phenylindole- Greenish grey. Do..- lethyl-2-phenylindole- Do.

8 EXAMPLE 2 10 parts by weight 4-dimethylamino-4-methoxy-benzophenone, 7.7 parts by weight 9-ethylcarbazole and 15 parts by weight phosphorus oxychloride are stirred at C. for 3 hours.

The hot melt is stirred into 500 parts by volume of water, and the water is decanted from the dyestuff resin after 2 hours.

The residue is dissolved in 100 parts by volume of glacial acetic acid, and 400 parts by volume of boiling water are then added with stirring.

The solution is clarified with active charcoals and the dyestutf precipitated in the form of violet bronzy crystals by the addition of 20 parts by weight of 20% hydrochloric acid and 20 parts by weight zinc chloride. The dyestutf so obtained corresponds to the formula N( a)n and dyes fibres of polyacrylonitrile in a currant-blue shade fast to light.

If the reaction is carried out with the amino benzophenones and carbazole derivatives listed in the following table according to the process described above, dyestuffs are also obtained which are characterised by very good dyeing properties and dye polyacrylonitrile fibres in the specified shades.

10 parts by weight 1,2,3,3-tetramethyl-S-benzoyldihydro-2,3-indole, 7.4 parts by weight l-methyl-Z-phenylindole and 15 parts by weight phosphorous oxychloride are heated together to 100 C. and stirred at this temperature for 3 hours. The hot melt is poured into 1000 parts by volume of water and stirred for 3 hours.

The dyestutf resin is then separated, dissolved in 1000 parts by volume of boiling water, the solution is clarified with active charcoal, and the dyestuff is salted out by the addition of 50 parts by weight sodium chloride. After fil- 9 tering oif with suction and drying, the dyestufi forms violet bronzy crystals. It corresponds to the formula EH-CH: U-iJ-CH:

alllldd dyes fibres of polyacrylonitrile in a violetish blue 5 a e.

If this reaction is carried out with the dihydro-2,3-indoles and indole derivatives listed in the following table according to the process described above, dyestuffs are also obtained which are characterised by very good fastness properties.

Polyacrylonitrile fibres are introduced at 40 C. in a liquor ratio of 1:40 into an aqueous bath containing, per litre, 0.75 g. of 30% acetic acid, 0.38 g. sodium acetate and 0.3g. of the phenyl-carbazolyl-indolyl-methane dyestufl described and illustrated by the formula in Example 1. The bath is heated to boiling temperature within minutes and kept at this temperature for 30-60 minutes. The polyacrylonitrile fibres are subsequently rinsed and dried. A greenish blue dyeing is obtained which is characterised by very good fastness to light and very good fastness to wet processing.

EXAMPLE 5 East Indian bastard leather which has been prepared for dyeing in the usual manner is dyed in a liquor ratio of 1:10 with 1% of the dyestuif described in Example 1 and previously pasted with the same amount of 30% acetic acid, in a drum at C. for minutes. The leather is finished in known manner. A greenish blue dyeing of good fastness properties is obtained. 5

EXAMPLE 6 Acid-modified polyglycol terephthalate fibres of the type Dacron 64 (Du Pont) or as are described in Belgian patent specification No. 549,179 and in US. patent specification No. 2,893,816 are introduced at 20 C. in a liquor ratio of 1:40 into an aqueous bath which contains, per litre, 3 g. sodium sulphate, 0.5-2 g. of an oleyl polyglycol ether moles ethylene oxide), 2.5-5 g. diphenyl and 0.3 g. of the dyestuff corresponding to the formula of Example 1, and which has been adjusted to a p11 value of 65 10 4.5-5.5 by means of acetic acid. The bath is heated to 98 C. within 30 minutes and kept at this temperature for 60 minutes. The fibres are subsequently rinsed and dried. A greenish blue dyeing of very good fastness properties is obtained.

EXAMPLE 7 Acid-modified polyglycol terephthalate fibres, such as in Example '6, are introduced at 20 C. in a liquor ratio of 1:40 into an aqueous bath which contains, per litre, 6-10 g. sodium sulphate, 0.5-1 g. oleyl polyglycol ether (50 moles ethylene oxide), 0-15 g. dimethylbenzyl-dodecyl ammonium chloride and 0.3 g. of the dyestuif corresponding to the formula of Example 1, and which has been adjusted to pH 4-5 by means of acetic acid. The bath is heated to C. within 30 minutes and kept at this temperature for 60 minutes. The fibres are subsequently rinsed and dried. A greenish blue dyeing of very good fastness properties is obtained:

What is claimed is:

1. Dyestuffs of the formula R stands for methyl or phenyl; R stands for hydrogen or lower alkyl; and X stands for an anionic radical.

2. A dyestuif of claim 1 of the formula CsHs References Cited FOREIGN PATENTS 8/1936 Great Britain 260315 OTHER REFERENCES JACS, vol. 67, pp. 1693-1701 (l945),-Branch et al.

HENRY R. I ILES, Primary Examiner S. D. WINTERS, Assistant Examiner US. Cl. X.R.

260-62611, 319.1, 570 AB, 326.1'6, 55-8 R, "559 S 

